| 词条 | Eratosthenes (crater) | |||||||||||||||||||||||||||||||||
| 释义 |
| image = Eratosthenes (LRO).png | image_size = | caption = Lunar Reconnaissance Orbiter image | coordinates = {{coord|14.47|N|11.32|W|globe:moon_type:landmark|display=inline,title}} | diameter = 59 km | depth = 3.6 km | colong = 12 | eponym = Eratosthenes }} Eratosthenes crater is a relatively deep lunar impact crater that lies on the boundary between the Mare Imbrium and Sinus Aestuum mare regions. It forms the western terminus of the Montes Apenninus mountain range. It is named after ancient Greek astronomer Eratosthenes of Cyrene,[1] who estimated the circumference of the Earth, and the distance from the Earth to the Sun. DescriptionThe crater has a well-defined circular rim, terraced inner wall, central mountain peaks, an irregular floor, and an outer rampart of ejecta. It lacks a ray system of its own, but is overlain by rays from the prominent crater Copernicus to the south-west. The Eratosthenian period in the lunar geological timescale is named after this crater, though it does not define the start of this time period. The crater is believed to have been formed about 3.2 billion years ago. At low Sun-angles, this crater is prominent due to the shadow cast by the rim. When the Sun is directly overhead, however, Eratosthenes visually blends into the surroundings, and it becomes more difficult for an observer to locate it. The rays from Copernicus lie across this area, and their higher albedo serves as a form of camouflage. In 1851 Shropshire Astronomer Henry Blunt constructed a model of the moon's surface showing Eratosthenes. The model is based on observations made by Blunt with a reflecting telescope from his home in Shrewsbury and was displayed in the same year at the Great Exhibition, London. In 1910–1920th, William H. Pickering noted dark patches in the crater that varied in a regular manner over each lunar day. He put forward the speculative idea that these patches appeared to migrate across the surface, suggestive of herds of small life forms.[3][4] The idea received a degree of attention primarily due to Pickering's reputation. Satellite cratersBy convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to Eratosthenes.
References1. ^{{cite web|series=Gazetteer of Planetary Nomenclature|title=Eratosthenes|url=http://planetarynames.wr.usgs.gov/Feature/1820|website=usgs.gov|publisher=International Astronomical Union|accessdate=September 21, 2017}} [2][3]2. ^1 {{cite journal |title =Eratosthenes I, a study for the amateur |author =Pickering, W. H. |journal=Popular Astronomy |volume =27 |date =1919 |pages =579–583 |url =http://articles.adsabs.harvard.edu/full/1919PA.....27..579P |bibcode=1919PA.....27..579P}} 3. ^1 {{cite journal |title =Eratosthenes|number =6 |author =Pickering, W. H. |journal=Popular Astronomy |volume =32 |date =1924 |pages =392–404 |url =http://articles.adsabs.harvard.edu/full/1924PA.....32..393P |bibcode=1924PA.....32..393P}} }} Further reading{{refbegin}}
|last1 = Andersson |first1 = L. E. |last2 = Whitaker |first2 = E. A. |authorlink2 = Ewen Whitaker |date = 1982 |title = NASA Catalogue of Lunar Nomenclature |publisher = NASA RP-1097 |ref = harv |url = http://planet4589.org/astro/lunar/RP-1097.pdf |deadurl = bot: unknown |archiveurl = https://web.archive.org/web/20141006125838/http://planet4589.org/astro/lunar/RP-1097.pdf |archivedate = 2014-10-06 |df = }}
| last1 = Bussey | first1 = B. | authorlink1 = Ben Bussey | last2 = Spudis | first2 = P. | authorlink2 = Paul Spudis | date = 2004 | title = The Clementine Atlas of the Moon | publisher = Cambridge University Press | location = New York | isbn = 978-0-521-81528-4 | ref = harv
| last1 = Cocks | first1 = Elijah E. | last2 = Cocks | first2 = Josiah C. | date = 1995 | title = Who's Who on the Moon: A Biographical Dictionary of Lunar Nomenclature | publisher = Tudor Publishers | isbn = 978-0-936389-27-1 | ref = harv
| last = McDowell | first = Jonathan | date = July 15, 2007 | url = http://host.planet4589.org/astro/lunar/ | title = Lunar Nomenclature | publisher = Jonathan's Space Report | accessdate = 2007-10-24 | ref = harv
| first = Patrick | last = Moore | authorlink = Patrick Moore | date = 2001 | title = On the Moon | publisher = Sterling Publishing Co. | isbn = 978-0-304-35469-6 | ref = harv
| first = Fred W. | last = Price | date = 1988 | title = The Moon Observer's Handbook | publisher = Cambridge University Press | isbn = 978-0-521-33500-3 | ref = harv
| last = Rükl | first = Antonín | authorlink = Antonín Rükl | date = 1990 | title = Atlas of the Moon | publisher = Kalmbach Books | isbn = 978-0-913135-17-4 | ref = harv
| last = Webb | first = Rev. T. W. | authorlink = Thomas William Webb | date = 1962 | title = Celestial Objects for Common Telescopes | edition = 6th revised | publisher = Dover | isbn = 978-0-486-20917-3 | ref = harv
| first = Ewen A. | last = Whitaker | authorlink = Ewen Whitaker | date = 2003 | title = Mapping and Naming the Moon | publisher = Cambridge University Press | isbn = 978-0-521-54414-6 | url = https://books.google.com/books?id=aV1i27jDYL8C | ref = harv
|title =Observing the Moon |url =https://books.google.com/books?id=TWtLIOlPwS4C |author =Wlasuk, Peter T. |date =2000 |publisher =Springer Science & Business Media |isbn =978-1-852-33193-1 }}{{refend}} External links
1 : Impact craters on the Moon |
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